Plant for heating the gas and air for combustion in gas-furnaces.



' UNITED STATES PATENT OFFICE.

OSKAR ZAHN, OF BERLIN, GERMANY,

PLANT FOR HEATING THE GAS AND AIR FOR COMBUSTION IN GAS-FURNACES.

Specification of Letters Patent.

Patented Oct. 12, 1909.

Application filed January 25, 1907. Serial No. 354,043.

To all whom it may concern:

Be it known that I, OSKAR ZAHN, engineer, a subject of theAustro-I-Iungarian Emperor, and residing at 50 Fasanenstrasse, in thecity of Berlin, Kingdom of Prussia, and German Empire, have inventedcertain new and use-o ful Improvements in Plants for Heating the Gas andAir for Combustion in Gas-Furnaces, of which the following is aspecification.

My invention relates to a plant for heating the gas and air forcombustion in gas furnaces.

i-rccording to this invention, two separate systems of fines for heatingare provided, of which the one system serves to warm the heating-gasconduit from one or more sides by means of waste-gas, while the othersystem heats the air-duct from one or more sides, likewise by means ofwaste-gas.

For warming the heating gas and air, the waste-gas or heat can be usedalone. Or instead of the waste-gas, a special source of heat may beemployed to warmif desired by direct flame-the conduit for theheatinggas and the air-ducts. Or' the preliminary heating may beeiiected by the waste-heat or gas in conjunction with a special sourceof heat. The latter method is to be recommended for all plants in whichthe waste-heat alone is not sufficient for adequately heating the airand gas, such as is the case with evaporating-pans and the like. Forhere suflicient heating of the gas and air for insuring smokelesscombustion is necessary, since the gases, immediately they strike thecolder wall of the pan, are cooled down below the temperature ofcombustion and therefore give rise to smoke and soot.

The direct heat or flame can be obtained from the same source whichheats the furnace, or from some other source. In this manner the plant,to be hereinafter described in detail, for warming the heating-gas andthe air necessary for combustion, can also be employed in all thosecases in which the Waste-heat at disposal is alone insufiicient forthorough preheating of the gas and air.

The accompanying drawing shows one form of construction of theinvention, the figure being a vertical section.

1 is the-ai'r-duct, and 2 the heating-gas conduit. The former issurrounded by four fines 3, 4', 5, 6, through which waste-heat or gas,or direct heat or flame can pass. In like manner the heating-gas conduit9 is surrounded by four flues 7, 8, 9, 10 through which Waste-heat orgas, or direct heat or flame passes. With this arrangement, naturally,not only the heating gas, but also the air necessary for combustion isvery thoroughly heated.

Having thus described my invention, I claim as new and desire to secureby Letters Patent In a gas furnace, in combination, a heating gasconduit, and an air duct, and two separate systems of fiues, one forheating the incoming gas from one or more sides, and the other forheating the incoming air froi'n one or more sides, substantially asdescribed.

Dated January 10th, 1907.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

OSKAR ZAHN.

Witnesses:

EMIL LUCAS, OTTO HENER.

